more information on that coming up. >>> when newtown police stormed into sandy hook elementary school here in the small community, illustrated a shift in the tactical approach that law enforcement has taken in light of the columbine shooting, some 13 years ago. joining us now for a closer look at how law enforcement is dealing with it, what has, unfortunately, become a tragic and sad chapter in america's history. former fbi profiler tom fuentes, assistant director of the fbi and jim johnson, chairman of the, he's first of all, baltimore county police chief and chairman of the national law enforcement partnership to prevent gun violence. gentlemen, thanks very much for coming in. chief johnson, let me start with you. the notion of quickly going into a situation like this rather than studying it from the outside. this is a relatively new tactical move, right? >> certainly over the last ten years law enforcement has entered into the active shooter scenario where we do not wait. when we have sufficient personnel and equipment and tools, we make an entry to stabilize the situation. >> the